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I got a lumia 510 last week and am quite happy with the phone functions and features when compared to its affordable price. But over the last few days I have noticed two issues on my phone. One thing is that during calls I feel that voice clarity is not so good and that there is a slight voice break at times. Another issue is that sometimes when I make calls or get incoming calls the earpiece just doesn't work but I can hear the voice of the person on the other side of the call if I use a headset and this problem vanishes as soon as I restart the phone. Is this a relatively common issue that other Lumia 510 users are facing and not worry about it or take it to a Nokia care centre for service?
have you checked that you are up-to-date with the latest firmware installed on your device, via checking via Zune on your PC? if there are any updates, please update to the latest version offered. also check that you are up-to-date with all the latest Nokia system apps in the Marketplace. also try performing a soft reset (pressing the volume down and power buttons together until the phone vibrates).
My phone is already updated to wp7.8.And after the last similar incident happened regarding defunct ear piece I tried the soft reset. The incident hasnt happened till now. I will just and wait and see.